hibernate - EntityManagerFactoryWrapper 不能强制转换为 SessionFactoryImplementor

Question

我正在尝试在 java ee 7 上学习 jpa 多租户。我正在关注本教程。

https://developers.redhat.com/blog/2020/06/15/jakarta-ee-multitenancy-with-jpa-on-wildfly-part-1/

但我得到以下错误：

at org.glassfish.grizzly.threadpool.AbstractThreadPool$Worker.run(AbstractThreadPool.java:545)
at java.lang.Thread.run(Thread.java:748)
Caused by: javax.ejb.TransactionRolledbackLocalException: Exception thrown from bean
at com.sun.ejb.containers.EJBContainerTransactionManager.checkExceptionClientTx(EJBContainerTransactionManager.java:662)
at com.sun.ejb.containers.EJBContainerTransactionManager.postInvokeTx(EJBContainerTransactionManager.java:507)
at com.sun.ejb.containers.BaseContainer.postInvokeTx(BaseContainer.java:4566)
at com.sun.ejb.containers.BaseContainer.postInvoke(BaseContainer.java:2074)
... 125 more
Caused by: java.lang.ClassCastException: com.sun.enterprise.container.common.impl.EntityManagerFactoryWrapper cannot be cast to org.hibernate.jpa.internal.EntityManagerFactoryImpl
at net.rhuanrocha.dao.Dao.getEntityManager(Dao.java:21)
at net.rhuanrocha.dao.JobDao.findAll(JobDao.java:13)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)

在 Dao.java -> getEntityManager()

我的 Maven 依赖项如下：

1. javax javaee-web-api 7.0 提供
2. org.hibernate hibernate-entitymanager 5.0.7.Final jar

我使用 Glassfish 4.1 作为服务器和 JDK 8。导入如下：

1. 导入 org.hibernate.engine.spi.SessionFactoryImplementor；
2. 导入 org.hibernate.jpa.internal.EntityManagerFactoryImpl；
3. 导入 javax.persistence.EntityManagerFactory；
4. 导入 javax.persistence.PersistenceUnit；
5. 导入 javax.persistence.EntityManager；

标签： hibernatemulti-tenantjpa-2.1

Answer 1

这行得通。我使用的后端是 Jakarta EE 8、Hibernate 5.4 和 Payara 2021。我认为您的版本也应该可以工作。

import com.dao.multitenancy.MultitenancyResolver;
import javax.persistence.EntityManager;
import javax.persistence.EntityManagerFactory;
import javax.persistence.PersistenceUnit;
//import org.eclipse.persistence.internal.jpa.EntityManagerFactoryImpl;
import org.hibernate.engine.spi.SessionFactoryImplementor;

/**
 *
 * @author Peter
 */
public abstract class Dao {

    @PersistenceUnit
    private EntityManagerFactory emf;

    public EntityManager getEM(final String tenantId) {

        //EntityManagerFactory entityManagerFactory = entityManagerFactory();
       final SessionFactoryImplementor sf = emf.unwrap(SessionFactoryImplementor.class);
          
        final MultitenancyResolver tenantResolver = (MultitenancyResolver) sf.getCurrentTenantIdentifierResolver();
        tenantResolver.setTenantIdentifier(tenantId);

        return emf.createEntityManager();
    }

}

参考：https ://docs.jboss.org/hibernate/orm/5.4/userguide/html_single/Hibernate_User_Guide.html#events-interceptors